
.switch{
  --switch-width: 80px;
  --switch-height: calc(var(--switch-width) / 2);
  --switch-border-radius: 999vw; /* this will also adjust the radius on the toggle */
  --switch-clr-border: rgba(255 255 255 / .25);
  --switch-clr-bg: rgb(41 37 36);
  --switch-clr-bg-on: green;
  --switch-inset: 2px; 
  --switch-duration: 300ms;
  
  --toggle-size: calc(var(--switch-height) - var(--switch-inset) * 3);
  --toggle-gap: calc(var(--toggle-size) * 1.5);
  --toggle-bg: #404040;
  --toggle-bg-on: #F3F4F6;
  
  --led-size: 8px;
  --led-color-off: rgba(255 255 255 / .15);
  --led-color-on: rgb(56, 189, 248);
  --led-color-loading: rgb(234 179 8);
  --led-duration: 3s;
  --led-delay: 500ms;
  --led-blur: 12px;
  --led-blur-distance: -.5rem;
  
  display: flex;
  align-items: center;
  gap: .75rem;
  width: fit-content;
}

.switch label{
  position: relative;
  cursor: pointer;
  overflow: hidden;
  width: var(--switch-width);
  height: var(--switch-height);
  border-radius: var(--switch-border-radius);
  border: 1px solid var(--switch-clr-border);
  outline: 1px dashed transparent;
  outline-offset: 4px;
  color: var(--switch-clr-txt);
  background-color: var(--switch-clr-bg);
  isolation: isolate;
  transition-property: background-color;
  transition-duration: var(--switch-duration);
  transition-timing-function: ease-in-out;
  transition-delay: var(--switch-delay,0ms);
}
.switch > .icon{
  display: grid;
  grid-template-areas: "stack";
}

.switch > .icon > svg{
  grid-area: stack;
  scale: var(--icon-on,0);
  transition: scale 150ms ease-in-out var(--icon-delay,0ms);
}
.switch > .icon > svg:last-of-type{
  scale: var(--icon-off,1);
}

.switch input[type="checkbox"] {
  position: absolute;
  pointer-events: none;
  appearance: none;
  border: none;
  outline: none;
  border-radius: inherit;
  background-color: var(--toggle-bg);
  top: var(--switch-inset);
  left: var(--toggle-x,var(--switch-inset));
  width: var(--toggle-size);
  height: var(--toggle-size);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--toggle-gap);

  transition-property: left, background-color;
  transition-duration: var(--switch-duration);
  transition-timing-function: ease-in-out;
}
.switch input[type="checkbox"]::before,
.switch input[type="checkbox"]::after{
  position: relative;
  color: white;
  transition: scale var(--switch-duration);
  
}
.switch input[type="checkbox"]::before{
  content: attr(data-on);
  scale: var(--label-scale-on, .75);
}
.switch input[type="checkbox"]::after{
   content: attr(data-off);
  scale: var(--label-scale-off, 1);
}

.switch > .led{
  position: relative;
  width: var(--led-size);
  height: var(--led-size);
  display: block;
  border: 1px solid rgba(255 255 255 / .25);
  border-radius: 50%;
  background-color: var(--led-color-off) ;
  transition: background-color 50ms;
  animation: var(--led-animation,"")
}
.switch > .led:before{
  content: '';
  position: absolute;
  inset: var(--led-blur-distance);
  z-index: -1;
  border-radius: inherit;
  filter: blur(var(--led-blur));
  opacity: .75;
  animation: var(--led-animation,"")
}
.switch:has(input[type="checkbox"]:focus-visible) label{
  outline-color: white; 
}
/* switch "on" */
.switch:has(input[type="checkbox"]:checked){
  --switch-clr-bg: var(--switch-clr-bg-on);
  --switch-delay: 250ms; /* slight delay on background color change */
  --toggle-x: calc(50% + var(--switch-inset));
  --toggle-clr-bg: green;
  --toggle-bg: var(--toggle-bg-on);
  --led-animation: toggle var(--led-duration) linear forwards var(--led-delay);
  --icon-on: 1;
  --icon-off: 0;
  --icon-delay: 250ms;
  --label-scale-off: .75;
  --label-scale-on: 1;
}
@keyframes toggle{
  0%,10%,20%,30%,40%,50%,60%,70%,80%{
    background-color: var(--led-color-off);
  }
  5%,15%,25%,35%,45%,55%,65%,75%,85%{
    background-color: var(--led-color-loading);
  }
  100%{
    background-color: var(--led-color-on);
  }
}




/* general styling not relevant for this demo */
*,
::before,
::after {
  
  box-sizing: border-box;
}
:root {
  --clr-bg: #222;
  --clr-primary: #f5f5f5;
  --clr-secondary: #075985; 
}
input{
  margin: 0;
  padding: 0;
}
html {
  background-color: var(--clr-bg);
  font-family: system-ui;
}

body {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  /*font-size: clamp(0.9rem, 2.5vw,1.4rem);*/
  color: var(--clr-primary);
  padding: 1rem;
  background-image: radial-gradient(circle, rgba(175, 208, 84, .25) 1px, rgba(0, 0, 0, 0) 1px);
  background-size: 40px 40px;
}

body::after {
  content: "";
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 32px;
  height: 32px;
  background-size: cover;
  background-image: url('data:image/svg+xml,<svg id="logo" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 100 100" version="1.1"><g id="surface1"><path fill="rgb(175, 208, 84)" d="M 47.894531 0.789062 C 46.320312 0.878906 45.480469 0.949219 44.601562 1.042969 C 37.023438 1.863281 29.746094 4.394531 23.386719 8.414062 C 20.214844 10.421875 17.402344 12.65625 14.757812 15.285156 C 7.773438 22.222656 3.027344 30.992188 1.113281 40.5 C -0.460938 48.332031 -0.132812 56.378906 2.070312 64.003906 C 4.0625 70.890625 7.507812 77.195312 12.277344 82.675781 C 16.65625 87.714844 22.109375 91.898438 28.074219 94.804688 C 37.914062 99.59375 49.078125 101.03125 59.875 98.886719 C 69.480469 96.976562 78.265625 92.300781 85.253906 85.371094 C 92.304688 78.386719 97.027344 69.65625 98.960938 60.039062 C 99.636719 56.675781 99.902344 53.996094 99.902344 50.285156 C 99.902344 47.910156 99.855469 46.925781 99.660156 45.128906 C 98.671875 35.808594 95.136719 27.136719 89.324219 19.773438 C 86.917969 16.722656 83.851562 13.675781 80.777344 11.285156 C 75.664062 7.304688 69.949219 4.410156 63.695312 2.628906 C 60.5625 1.742188 57.058594 1.128906 53.609375 0.867188 C 52.796875 0.804688 48.566406 0.746094 47.894531 0.789062 Z M 54.105469 24.300781 C 54.105469 24.355469 53.550781 25.921875 52.875 27.773438 L 51.636719 31.148438 L 41.390625 31.148438 C 34.375 31.148438 31 31.167969 30.683594 31.210938 C 27.867188 31.601562 25.414062 33.695312 24.371094 36.621094 C 24.054688 37.503906 23.910156 38.265625 23.839844 39.371094 C 23.800781 40.046875 23.789062 43.769531 23.804688 50.574219 C 23.828125 61.464844 23.816406 60.867188 24.101562 62.066406 C 24.316406 62.976562 24.832031 64.132812 25.339844 64.875 C 26.515625 66.597656 28.074219 67.726562 29.9375 68.203125 C 30.679688 68.394531 31.542969 68.433594 34.851562 68.433594 C 37.878906 68.433594 37.960938 68.441406 37.925781 68.542969 C 37.90625 68.601562 37.34375 70.148438 36.671875 71.972656 L 35.460938 75.296875 L 32.726562 75.296875 C 30.136719 75.296875 29.960938 75.285156 29.269531 75.164062 C 26.808594 74.714844 24.59375 73.707031 22.644531 72.152344 C 22.015625 71.648438 20.859375 70.496094 20.335938 69.847656 C 18.960938 68.15625 17.824219 65.824219 17.285156 63.601562 C 16.824219 61.660156 16.835938 62.175781 16.859375 49.355469 C 16.882812 36.71875 16.847656 37.765625 17.292969 35.953125 C 17.882812 33.523438 18.941406 31.398438 20.515625 29.5 C 21.140625 28.746094 21.625 28.257812 22.417969 27.597656 C 24.695312 25.699219 27.460938 24.53125 30.316406 24.265625 C 30.589844 24.234375 36.054688 24.210938 42.460938 24.207031 C 53.515625 24.199219 54.105469 24.207031 54.105469 24.300781 Z M 66.320312 24.363281 C 69.789062 24.90625 72.703125 26.371094 75.039062 28.757812 C 76.65625 30.402344 77.730469 32.21875 78.382812 34.417969 C 78.683594 35.445312 78.824219 36.347656 78.867188 37.523438 C 78.964844 40.515625 78.066406 43.320312 76.21875 45.777344 C 75.949219 46.136719 75.707031 46.445312 75.675781 46.460938 C 75.558594 46.539062 75.636719 46.605469 76.246094 47 C 80.933594 50.003906 83.621094 55.320312 83.308594 60.960938 C 83.027344 65.992188 80.328125 70.570312 76.113281 73.175781 C 74.453125 74.199219 72.570312 74.894531 70.546875 75.21875 L 69.757812 75.347656 L 56.425781 75.363281 L 43.085938 75.386719 L 43.273438 74.878906 C 43.371094 74.601562 43.949219 73.027344 44.546875 71.386719 L 45.640625 68.40625 L 57.613281 68.375 L 69.582031 68.347656 L 70.167969 68.191406 C 72.121094 67.652344 73.628906 66.617188 74.753906 65.019531 C 75.40625 64.097656 75.960938 62.777344 76.175781 61.632812 C 76.328125 60.832031 76.328125 59.308594 76.175781 58.503906 C 75.867188 56.859375 75.085938 55.316406 73.960938 54.152344 C 72.835938 52.976562 71.722656 52.308594 70.191406 51.894531 L 69.582031 51.730469 L 52.117188 51.703125 L 34.65625 51.671875 L 35.691406 48.835938 C 36.265625 47.273438 36.835938 45.703125 36.96875 45.351562 L 37.207031 44.695312 L 51.269531 44.679688 L 65.328125 44.667969 L 65.941406 44.511719 C 68.972656 43.753906 71.089844 41.820312 71.71875 39.214844 C 71.890625 38.496094 71.898438 37.390625 71.722656 36.699219 C 71.019531 33.839844 68.550781 31.78125 65.21875 31.253906 C 64.984375 31.21875 63.597656 31.171875 62.058594 31.15625 L 59.3125 31.121094 L 60.523438 27.789062 C 61.195312 25.960938 61.769531 24.398438 61.800781 24.324219 L 61.863281 24.183594 L 63.710938 24.21875 C 65.164062 24.242188 65.722656 24.269531 66.320312 24.363281 Z M 66.320312 24.363281 "/></g></svg>');
}
h1 {
  font-size: clamp(1rem, 2.5vw + 0.25rem, 1.2rem);
  font-weight: 500;
  line-height: 1.6;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}
